US3764845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric filament lamp
Assignee: US Philips Corp
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Filing: 1972-04-27
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Granted: 1973-10-09
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Expires: 1992-04-27
Abstract
Abstract The invention relates to an electric filament lamp having a tubular lamp envelope provided with a pinch seal in which two series-arranged filaments are incorporated which are coupled by a brace. The brace comprises a loop in which a supporting wire is inserted. The shape of the loop and the cross-section of the brace are non-circular, for example, elongate, so as to limit the mutual rotatability.
Inventors
- 👤 Fraeye D De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:08
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
155 words
An electric filament lamp comprising a tubular lamp envelope having on at least one end a pinch seal with current conductors incorporated therein, two series-arranged filaments being stretched in the longitudinal direction of the lamp envelope, said filaments being connected electrically at one of their ends to the current conductors and, at their ends most remote from the pinch seal, being coupled by means of a brace which near the centre of its length comprises at least one loop in which the end of a supporting wire fixed in the lamp envelope is secured, the loop being secured to the supporting wire so as to be nonrotatable in the plane in which the loop is located, and wherein the loop and the cross-section of the supporting wire have noncircular shapes which have been chosen to be so that in the assembled condition of the loop and the supporting wire they limit the mutual rotatability thereof.
Claim 2
Dependent Claim
155 words
An electric filament lamp comprising a tubular lamp envelope having on at least one end a pinch seal with current conductors incorporated therein, two series-arranged filaments being stretched in the longitudinal direction of the lamp envelope, said filaments being connected electrically at one of their ends to the current conductors and, at their ends most remote from the pinch seal, being coupled by means of a brace which near the centre of its length comprises at least one loop in which the end of a supporting wire fixed in the lamp envelope is secured, the loop being secured to the supporting wire so as to be nonrotatable in the plane in which the loop is located, and wherein the loop and the cross-section of the supporting wire have noncircular shapes which have been chosen to be so that in the assembled condition of the loop and the supporting wire they limit the mutual rotatability thereof.
Claim 3
Dependent Claim
38 words
An electric filament lamp as claimed in claim 1, wherein at least at the area of the connection to the loop, the supporting wire has at least one flat side against which a part of the loop bears.
Claim 4
Dependent Claim
28 words
An electric filament lamp as claimed in claim 1, wherein at least at the area of the connection to the loop, the supporting wire has an elongate cross-section.
Claim 5
Dependent Claim
28 words
An electric filament lamp as claimed in claim 1 wherein the supporting wire has a rectangular cross section, at least at the area of connection to the loop.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |